We study the possibility of stabilizing broad-area dynamic class B lasers, which include those with periodic pump modulation, by using injection of external optical radiation. The dynamics of a ...broad-area laser is analyzed by obtaining the dispersion curves and the bifurcation diagram as well as by numerical simulation of a two-dimensional nonstationary system of the Maxwell– Bloch equations. As a result, it is shown that the injection of an external coherent field effectively suppresses both the wave and Faraday (parametric) instability.
The article deals with topical issues of the possibility of using the mechanism of public private partnership in the construction of logistics centers for processing and marketing of agricultural ...products. The development of the agro-industrial complex creates a favorable atmosphere for cooperation between the state and private business. The use of this mechanism allows both parties to obtain the maximum benefit from such an Alliance. It is necessary to consider the possibility, prospects and economic efficiency as a result of the construction of logistics complexes for agricultural products. The favorable outcome will be the opportunity for farmers and the local population to sell their products, an increase in the number of jobs and an increase in the reserves of the raw material base. The article presents the prospects for the use of the PPP mechanism in the construction of logistics centers of the agro-industrial complex. The authors of the article analyze the effectiveness of this mechanism in modern conditions and put forward proposals to optimize the process.
The spatiotemporal dynamics of broad lasers with anisotropy is studied. Anisotropy in broad-area lasers leads to different thresholds for x- and y-polarized modes. In addition, the transverse wave ...numbers for the x- and y-polarized modes can also differ. The investigated regimes were observed experimentally in semiconductor vertical cavity surface emitting laser with cryogenic cooling. Our theoretical results agree well with the experimental data.
Transverse dynamics of a broad-area semiconductor surface-emitting laser with a vertical resonator (VCSEL) with еxternal optical injection was investigated above threshold. It is obtained that two ...types of instabilities can develop in system: Turing and Hopf instabilities. Turing instability in turn can be subdivided into plane-wave instability (PWI) and modulation instability (MI). We found some sets of system parameters where the steady-state curve of the homogeneous solution can be bistable or monostable. Modulation instability can lead to the development of spatial patterns, which was obtained.
The present paper is concerned with the analytical and numerical investigation of the transverse spatio-temporal instabilities in two-level broad-area lasers for the specific class-B case. We show ...that the two-level class-B broad-area laser tends to naturally operate in the filamentary state. This is revealed to be provided with two causes. First of them is related with the homogeneous output profile being intrinsically unstable due to the traveling-wave instability, independently from the boundary conditions. Secondly, high sensitivity to the boundaries of the pumping region was found for the commonly used top-hat-like profile leading to boundaries-induced filamentary dynamics. Spatio-temporal properties of both instability mechanisms are studied and their effects on the resulting laser dynamical behavior are analyzed.
•Two-level class-B broad-area lasers naturally tend to operate in filamentary state.•Two instability mechanisms are responsible for the filamentation onset.•A uniform intensity profile turns to be intrinsically unstable in the class-B case.•Class-B broad-area lasers are extremely sensitive to boundaries effects.
In this paper, spatiotemporal dynamics of broad-area lasers with external optical injection is investigated. We demonstrate theoretically that relatively small optical injection suppresses unstable ...transverse modes and stabilizes laser output. In this paper, the general case of a mismatch in the frequency of the radiation injected and generated by a laser was numerically investigated. It is shown that the frequency mismatch does not destroy the stabilizing effect.
We studied temporal dynamics of optical field in a resonator with the nonlinear left-handed metamaterial of Kerr type and optical feedback with a time delay on the basis of the Lugiato-Lefever model. ...We constructed bifurcation diagrams showing the parametric regions of a stationary optical field and unstable periodic orbits formations with a different number of "steps" of the optical field. These unstable periodic orbits are similar to heterocliniccycles, which are being actively investigated in nonlinear dynamics.
Dynamics of the broad-area laser with time-periodic modulation of the pump parameter and external optical radiation injection is theoretically studied. It is shown that injection efficiently ...suppresses transverse instabilities resulting from pump modulation. The injected signal parameters at which transverse instabilities are efficiently suppressed are determined.
It is shown that optical injection can suppress unstable transverse modes, thus stabilizing broad-area laser emission. The general case of noncoinciding frequencies of injected radiation and laser ...emission is numerically studied. It is shown that the frequency noncoincidence does not degrade the stabilizing effect.
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